<template>
    <div>
        <!-- 面包屑导航 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>权限管理</el-breadcrumb-item>
            <el-breadcrumb-item>角色列表</el-breadcrumb-item>
        </el-breadcrumb>
        <!-- 卡片视图 -->
        <el-card>
            <el-row>
                <el-col>
                    <el-button type="primary">添加角色</el-button>
                </el-col>
            </el-row>
            <el-table :data="rolesList" border stripe>
                <el-table-column type="expand">
                    <template slot-scope="scope">
                        <el-row :class="['bdbottom',i1===0?'bdtop':'', 'vcenter']" v-for="(item1, i1) in scope.row.children" :key="item1.id">
                            <!-- 渲染一级权限 -->
                            <el-col :span="6">
                                <el-tag closable @close="removeRightById(scope.row, item1.id)">{{item1.authName}}</el-tag>
                                <i class="el-icon-caret-right"></i>
                            </el-col>
                            <!-- 渲染二、三级权限 -->
                            <el-col :span="18">
                                <el-row :class="[i2===0?'':'bdtop', 'vcenter']" v-for="(item2, i2) in item1.children" :key="item2.id">
                                    <el-col :span="6">
                                        <el-tag type="success" closable @close="removeRightById(scope.row, item2.id)">{{item2.authName}}</el-tag>
                                        <i class="el-icon-caret-right"></i>
                                    </el-col>
                                    <el-col :span="18">
                                        <el-tag type="warning" v-for="(item3) in item2.children" :key="item3.id" closable @close="removeRightById(scope.row, item3.id)">{{item3.authName}}</el-tag>
                                    </el-col>
                                </el-row>
                            </el-col>
                        </el-row>
                        <!-- <pre>{{scope.row}}</pre> -->
                    </template>
                </el-table-column>
                <el-table-column type="index"></el-table-column>
                <el-table-column label="角色名称" prop="roleName"></el-table-column>
                <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
                <el-table-column label="操作" width="300px">
                    <template slot-scope="scope">
                        <el-button size="mini" type="primary" icon="el-icon-edit">编辑</el-button>
                        <el-button size="mini" type="warning" icon="el-icon-setting" @click="showSetRightDialog(scope.row)">分配权限</el-button>
                        <el-button size="mini" type="danger" icon="el-icon-dalete">删除</el-button>
                    </template>
                </el-table-column>
            </el-table>
        </el-card>
        <!-- 分配权限的对话框 -->
        <el-dialog title="分配权限" :visible.sync="setRightdialogVisible" width="50%" @close="setRightdialogClosed">
            <el-tree :data="rightsList" :props="treeProps" show-checkbox node-key="id" :default-expand-all="true" ref="treeRef" :default-checked-keys="defKeys"></el-tree>
            <span slot="footer" class="dialog-footer">
                <el-button @click="setRightdialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="allotRights">确 定</el-button>
            </span>
        </el-dialog>
    </div>
</template>

<script>
export default {
    data() {
        return {
            // 所有角色列表数据
            rolesList: [],
            // 控制分配权限对话框的显示和隐藏
            setRightdialogVisible: false,
            // 所有权限的数据
            rightsList: [],
            // 树形控件属性绑定对象
            treeProps: {
                label: 'authName',
                children: 'children'
            },
            // 默认选中的数组的id
            defKeys: [],
            // 即将分配权限的角色id
            roleId: ''
        }
    },
    created() {
        this.getRolesList()
    },
    methods: {
        async getRolesList() {
            const { data: result } = await this.$http.get('roles')
            if(result.meta.status !== 200) {
                return this.$message.error('获取角色列表失败！')
            }
            this.rolesList = result.data
        },
        // 根据id删除对应权限
        async removeRightById(role, rightId) {
            const confirmResult = await this.$confirm('此操作将永久删除，是否继续？', '提示', {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
            }).catch(err => err)
            if(confirmResult !== 'confirm') {
                return this.$message.info('您取消了删除')
            }
            const { data: result } = await this.$http.delete(`roles/${role.id}/rights/${rightId}`)
            if(result.meta.status !== 200) {
                return this.$message.error('删除权限失败！')
            }
            role.children = result.data
        },
        // 展示分配权限对话框
        async showSetRightDialog(role) {
            this.roleId = role.id
            // 获取所有权限的数据
            const { data: result } = await this.$http.get('rights/tree')
            if(result.meta.status !== 200) {
                return this.$message.error('获取权限失败！')
            }
            this.rightsList = result.data
            this.getLeafKeys(role, this.defKeys)// 递归获取三级结点id
            this.setRightdialogVisible = true
        },
        // 通过递归形式获得三级id，并保存到defKeys
        getLeafKeys(node, arr) {
            // 满足三级结点条件
            if(!node.children) {
                return arr.push(node.id)
            }
            node.children.forEach(item => this.getLeafKeys(item, arr))
        },
        // 监听权限对话框的关闭事件
        setRightdialogClosed() {
            this.defKeys = []
        },
        // 点击为角色分配权限
        async allotRights() {
            const keys = [
                ...this.$refs.treeRef.getCheckedKeys(),
                ...this.$refs.treeRef.getHalfCheckedKeys()
            ]
            const idStr = keys.join(',')
            const { data: result } = await this.$http.post(`roles/${this.roleId}/rights`, { rids: idStr })
            if(result.meta.status !== 200) {
                return this.$message.error('分配权限失败！')
            }
            this.$message.success('分配权限成功！')
            this.getRolesList()
            this.setRightdialogVisible = false
        }
    }
}
</script>

<style lang="less" scoped>
.el-tag{
    margin: 7px;
}
.bdtop{
    border-top: 1px solid #eee;
}
.bdbottom{
    border-bottom: 1px solid #eee;
}
.vcenter{
    display: flex;
    align-items: center
}
</style>
